Northwest's DC-10's

Date:         16 Jun 98 02:15:40 
From:         ehaase2463@aol.com (EHaase2463)
Organization: AOL http://www.aol.com
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The June issue of World Airline Fleets states that Northwest estimates
a 42 year life for 173 of its DC-9's and an even longer life for its
DC-10's.  The article indicates that the DC-9's may last for 15 more
years and that DC-10 could fly 23 more years.  Is it desirable and
realistic for a major airline to keep its aircraft for so long?